21020377443 has 32 divisors (see below), whose sum is σ = 30443723520. Its totient is φ = 12824196480.

The previous prime is 21020377409. The next prime is 21020377501. The reversal of 21020377443 is 34477302012.

It is not a de Polignac number, because 21020377443 - 2¹² = 21020373347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21020377643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4448280 + ... + 4453002.

It is an arithmetic number, because the mean of its divisors is an integer number (951366360).

Almost surely, 2^21020377443 is an apocalyptic number.

21020377443 is a deficient number, since it is larger than the sum of its proper divisors (9423346077).

21020377443 is a wasteful number, since it uses less digits than its factorization.

21020377443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5699.

The product of its (nonzero) digits is 28224, while the sum is 33.

Adding to 21020377443 its reverse (34477302012), we get a palindrome (55497679455).

The spelling of 21020377443 in words is "twenty-one billion, twenty million, three hundred seventy-seven thousand, four hundred forty-three".